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Protective layer for lithium sulphur battery, preparation method thereof and lithium sulphur battery using protective layer

A lithium-sulfur battery and protective layer technology, applied in the field of electrochemistry, can solve the problems that the shuttle effect is still obvious and the improvement effect is limited, and achieve the effects of improving Coulombic efficiency, low cost, and improving ion conductivity

Active Publication Date: 2015-03-04
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above strategy effectively improves the conductivity of elemental sulfur and improves the reactivity of elemental sulfur, but it has limited improvement effects on inhibiting the dissolution of polysulfides in the electrolyte and reducing the shuttling effect during battery charging and discharging, especially for low The shuttle effect is still obvious under the condition of rate charge and discharge

Method used

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  • Protective layer for lithium sulphur battery, preparation method thereof and lithium sulphur battery using protective layer
  • Protective layer for lithium sulphur battery, preparation method thereof and lithium sulphur battery using protective layer

Examples

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preparation example Construction

[0031] The protective layer preparation method of the present invention comprises the following steps:

[0032] 1) First take graphene oxide or graphene, and make it uniformly dispersed in a solvent or solution by means of stirring, ultrasonication and heating. The solvent is water, ethanol, propanol, N-methylpyrrolidone, acetone, dichloromethane, N , N-dimethylformamide or tetrahydrofuran; the solution is potassium hydroxide aqueous solution or sodium hydroxide aqueous solution;

[0033] Then add a modifier, the modifier is hydrofluoric acid, hydrochloric acid, sulfuric acid, nitric acid, polyethylene glycol, polyvinyl alcohol, ammonia water, hydrazine hydrate, hydrazine, ethylenediamine, triisopropanolamine, octadecylamine , N,N-dicyclohexylcarbodiimide, 3-aminopropyltriethoxysilane, acetic acid, chloroacetic acid, chlorosulfonic acid, thionyl chloride, propionic acid, potassium permanganate, sodium cyanide, Hydrogen cyanide, potassium cyanide, hydrogen thiocyanide, sodium ...

Embodiment 1

[0058] (1) Preparation of cathode composite material:

[0059] Weigh 10g of superconducting black (Super P) and place it in a flask, add 240mL of concentrated nitric acid dropwise into the flask, mix well, heat in a water bath to 80°C, keep the temperature for 3 hours, cool to room temperature, wash and filter to obtain modified superconducting black (m -Super P). Take 1g m-Super P, 0.1g polyethylene glycol (PEG) and 200mL deionized water and heat to 50°C, then add 20mL concentrated sulfuric acid and mix well, and keep the temperature at 60°C for 10h; then add 40mL concentrated sulfuric acid, dropwise A certain amount of Na 2 S and Na 2 SO 3 After the dropwise addition, continue to stir for 30 minutes, filter with suction, dry for subsequent use, and obtain the modified superconducting black / sulfur composite material (m-Super PS);

[0060] (2) Preparation of positive pole piece:

[0061] Mix m-Super PS, acetylene black, and LA132 uniformly in an aqueous solution at a mass...

Embodiment 2

[0072] (1) The preparation of positive electrode composite material, the preparation of positive pole sheet and the preparation method of graphene oxide are the same as in Example 1;

[0073] (2) Preparation of hydroxy-modified graphene:

[0074]Take 0.5g of graphene oxide and disperse it in 125mL of deionized water, after ultrasonic stirring for 1h, slowly add 2.5mL of 50% hydrazine hydrate dropwise, then reflux at 100°C for 24h; after the reflux, add 4g of 2-( 4-amino-phenyl)ethanol and 3mL isoamyl nitrite, continue to stir at 80 ° C, fully react, after the reaction is completed, cool to room temperature, the suspension is filtered with a microporous membrane, and excess deionized water and Washing with DMF, finally washing 3 times with acetone, and drying to obtain hydroxyl-modified graphene;

[0075] (3) Preparation of protective layer:

[0076] Hydroxyl-modified graphene is selected as the adsorption material of the protective layer, gelatin is used as the adhesive, and...

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Abstract

The invention discloses a protective layer for a lithium sulphur battery, a preparation method thereof and a lithium sulphur battery using the protective layer, which aim at effectively preventing polysulfide from shuttling back and forth in electrolyte and from corroding a lithium negative electrode, facilitating uniform deposition of discharge products on the surface of an electrode, improving the specific capacity of the lithium sulphur battery and prolonging the service life of the lithium sulphur battery. The technical liquid of the invention is as follows: the protective layer is prepared by coating slurry on the surface of a diaphragm, wherein the slurry comprises modified graphene and an adhesive with the mass ratio of (4-9):1; the modified graphene contains one or more of the following functional groups: alkyl, alkylene, aryl, halogen, -CN, -SCN, -NCO, -OH, -COOH, -NH2, -COX,-NO2, -SO3H, -COOR, -COR, -CONHR, -CONR2, -OR, -NHR and -NR2, wherein X = F, Cl, Br or I, and R = alkyl, alkylene or aryl; the adhesive is one or more of polyoxyethylene, polyvinylidene fluoride, polyacrylic acid, polytetrafluoroethylene, gelatin, sodium alginate and beta-cyclodextrin.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a protective layer for a lithium-sulfur battery, a preparation method thereof, and a lithium-sulfur battery using the protective layer. Background technique [0002] In recent years, lithium-sulfur secondary batteries using metallic lithium as the negative electrode and elemental sulfur as the positive electrode have attracted more and more attention due to their high energy density (2600Wh / kg) and specific capacity (1675mAh / g). As the key material of lithium-sulfur batteries, cathode materials have a great influence on the specific capacity, energy density and cycle life of lithium-sulfur batteries. However, the poor cycle performance of cathode materials has always been one of the biggest challenges restricting the industrialization of lithium-sulfur batteries. The root cause of this problem is: on the one hand, the poor conductivity of the active material...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M2/00H01M50/449
CPCH01M10/058H01M50/10H01M50/116Y02E60/10Y02P70/50
Inventor 赵生荣范瑞娟冯皓田占元邓增社
Owner SHAANXI COAL & CHEM TECH INST
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